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Peripheral parasite density of Plasmodium falciparum is used as an indicator of malaria disease severity, but does not quantify central sequestration, which is important in the pathogenesis of severe disease. Malaria pigment, recognizable within the cytoplasm of phagocytic cells by light microscopy may represent a peripheral marker for parasite biomass. One hundred seventy-two index cases of severe malaria and 172 healthy age-, residence-, and ethnicity-matched controls with uncomplicated malaria in Bandiagara, Mali were analyzed prospectively for presence of malaria pigment. The presence of polymorphonuclear cell (PMN) and monocyte pigment was strongly associated with severe disease compared with uncomplicated malaria. Total PMN pigment burden in children with severe malaria was higher in those with cerebral manifestations and with combined cerebral manifestations and severe anemia (hemoglobin 
5 g/dL) but was not associated with hyperparasitemia (> 500,000 asexual forms/mm3). Additionally, pigmented PMNs/mm3 was associated with a fatal outcome in patients with severe malaria. This study validates the presence of malaria pigment in monocytes and neutrophils as a marker for disease severity, and demonstrates that pigmented neutrophils are associated with cerebral malaria and with death in children with severe malaria.
Received April 29, 2003. Accepted for publication July 1, 2003.
Acknowledgments: We thank the members of the Severe Malaria in African Children Clinical Network for their work in the genesis of this study and the protocol to which we adhered. We also thank Timothy Mnalemba (Blantyre Malaria Project, Blantyre, Malawi) for his patient teaching, which was invaluable in identifying pigment and applying the protocols.
Financial support. This study was supported by contract no. N01-AI-85346 from the National Institutes of Health.
Authors’ addresses. Kirsten E. Lyke and Christopher V. Plowe, Malaria Section, Center for Vaccine Development, University of Maryland School of Medicine, 685 West Baltimore Street, HSF 480, Baltimore, MD 21201, Telephone: 410-706-3082, Fax 410-706-6205, Email: cplowe{at}medicine.umaryland.edu. Dapa A. Diallo, Alassane Dicko, Abdoulaye Kone, Drissa Coulibaly, Ando Guindo, Yacouba Cissoko, Lansana Sangare, Seydou Coulibaly, Blaise Dakouo, and Ogobara K. Doumbo, Malaria Research and Training Center, Department of Epidemiology of Parasitic Diseases, Faculty of Medicine, Pharmacy and Dentistry, University of Mali, BP 1805 Point G, Bamako, Mali, Fax 223-2-8109. Terrie E. Taylor, Department of Internal Medicine, College of Osteopathic Medicine, Michigan State University, B315-C W. Fee Hall, East Lansing MI 48824, Fax 517-432-1062.
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